fix http error code for PUT /obj

src/routes.rs

@@ -127,7 +127,7 @@ pub async fn put_object(
         body.extend_from_slice(&chunk);
     }
 
-    let entry = serde_json::from_slice::<Entry>(&body)?;
+    let entry = serde_json::from_slice::<Entry>(&body).map_err(ErrorBadRequest)?;
 
     let result_address = insert_entry(&connection, entry).map_err(ErrorInternalServerError)?;